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Proxy Server Systems for Wireless Mobile Web Service

Proxy Server Systems for Wireless Mobile Web Service. 劉仁筑 2001.11.29. Outline. Introduction Related Works Problem Statement Wireless Proxy Server Deployment Single Distributed Discussion and Ideals. Introduction. The characteristics of wireless networks Unfixed and lower bandwidth

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Proxy Server Systems for Wireless Mobile Web Service

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  1. Proxy Server Systems for Wireless Mobile Web Service 劉仁筑 2001.11.29

  2. Outline • Introduction • Related Works • Problem Statement • Wireless Proxy Server Deployment • Single • Distributed • Discussion and Ideals

  3. Introduction • The characteristics of wireless networks • Unfixed and lower bandwidth • Higher transmission error rate • Different MH hardware type • How to provide proper services and qualities for each mobile user is important.

  4. Related works • J. F. Bartlett, “W4 – the Wireless World Wide Web,” Workshop on Mobile Computing Systems and Applications, Dec. 1994, pp. 176-178. • Designed for PDA-based wireless browser. • Maintained a proxy to parse a HTML documents into multiple screens. • The proxy sends the preformatted screens to client using a new protocol.

  5. Related works • S. Gessler and A. Kotulla, “PDAs as Mobile WWW Browsers,” Electronic Proc. Second World Wide Web Conference ’94: Mosaic and the Web, Oct.1994. • The HTML documents was parsed by client. • The client communicates with the proxy also using a new protocol. • Images won’t be transferred until the client request them.

  6. Related works • T. B. Fleming, S. F. Midkiff, and N.J. Davis, ” Improving the Performance of the World Wide Web over Wireless Networks,” GLOBECOM ’97. • Designed a new protocol, named “ MHSP”, to replace the HTTP used between AP and MH. • Prefetching • Image reduction

  7. Related works • Common points • Maintaining a dedicated machine to be a wireless proxy • Most of them did not support mobility very well • Single proxy v.s Distributed proxy

  8. Problem Statement • Single proxy architecture • The proxy may become a bottleneck • Distributed proxy architecture • The handoff between proxy servers • Cached data • Distilled data • Client’s information • …

  9. Distilled data ? Distributed Proxy Server System Handoff

  10. Proxy Server Architecture Information Networking, 2001. Proceedings. 15th International Conference on , 2001 Figure.2, Page: 750

  11. Proxy Handoff Procedure

  12. Proxy Handoff Procedure (cont.)

  13. Proxy Handoff Procedure (cont.)

  14. Message Format • Handoff request message • Distilled data request message • Distilled data message

  15. Discussion • Proxy deployment area • Too large: degrading to single proxy scenario • The capability of MH should be more simple or complicated? • How to satisfy all type of service? • Not only WWW…

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